xref: /third_party/ffmpeg/libavcodec/cbs_bsf.c (revision cabdff1a) 
1/*
2 * This file is part of FFmpeg.
3 *
4 * FFmpeg is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
8 *
9 * FFmpeg is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with FFmpeg; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18
19#include "bsf.h"
20#include "bsf_internal.h"
21#include "cbs_bsf.h"
22
23static int cbs_bsf_update_side_data(AVBSFContext *bsf, AVPacket *pkt)
24{
25    CBSBSFContext           *ctx = bsf->priv_data;
26    CodedBitstreamFragment *frag = &ctx->fragment;
27    uint8_t *side_data;
28    int err;
29
30    if (!av_packet_get_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA, NULL))
31        return 0;
32
33    err = ff_cbs_read_packet_side_data(ctx->input, frag, pkt);
34    if (err < 0) {
35        av_log(bsf, AV_LOG_ERROR,
36               "Failed to read extradata from packet side data.\n");
37        return err;
38    }
39
40    err = ctx->type->update_fragment(bsf, NULL, frag);
41    if (err < 0)
42        return err;
43
44    err = ff_cbs_write_fragment_data(ctx->output, frag);
45    if (err < 0) {
46        av_log(bsf, AV_LOG_ERROR,
47               "Failed to write extradata into packet side data.\n");
48        return err;
49    }
50
51    side_data = av_packet_new_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA,
52                                        frag->data_size);
53    if (!side_data)
54        return AVERROR(ENOMEM);
55    memcpy(side_data, frag->data, frag->data_size);
56
57    ff_cbs_fragment_reset(frag);
58    return 0;
59}
60
61int ff_cbs_bsf_generic_filter(AVBSFContext *bsf, AVPacket *pkt)
62{
63    CBSBSFContext           *ctx = bsf->priv_data;
64    CodedBitstreamFragment *frag = &ctx->fragment;
65    int err;
66
67    err = ff_bsf_get_packet_ref(bsf, pkt);
68    if (err < 0)
69        return err;
70
71    err = cbs_bsf_update_side_data(bsf, pkt);
72    if (err < 0)
73        goto fail;
74
75    err = ff_cbs_read_packet(ctx->input, frag, pkt);
76    if (err < 0) {
77        av_log(bsf, AV_LOG_ERROR, "Failed to read %s from packet.\n",
78               ctx->type->fragment_name);
79        goto fail;
80    }
81
82    if (frag->nb_units == 0) {
83        av_log(bsf, AV_LOG_ERROR, "No %s found in packet.\n",
84               ctx->type->unit_name);
85        err = AVERROR_INVALIDDATA;
86        goto fail;
87    }
88
89    err = ctx->type->update_fragment(bsf, pkt, frag);
90    if (err < 0)
91        goto fail;
92
93    err = ff_cbs_write_packet(ctx->output, pkt, frag);
94    if (err < 0) {
95        av_log(bsf, AV_LOG_ERROR, "Failed to write %s into packet.\n",
96               ctx->type->fragment_name);
97        goto fail;
98    }
99
100    err = 0;
101fail:
102    ff_cbs_fragment_reset(frag);
103
104    if (err < 0)
105        av_packet_unref(pkt);
106
107    return err;
108}
109
110int ff_cbs_bsf_generic_init(AVBSFContext *bsf, const CBSBSFType *type)
111{
112    CBSBSFContext           *ctx = bsf->priv_data;
113    CodedBitstreamFragment *frag = &ctx->fragment;
114    int err;
115
116    ctx->type = type;
117
118    err = ff_cbs_init(&ctx->input, type->codec_id, bsf);
119    if (err < 0)
120        return err;
121
122    err = ff_cbs_init(&ctx->output, type->codec_id, bsf);
123    if (err < 0)
124        return err;
125
126    if (bsf->par_in->extradata) {
127        err = ff_cbs_read_extradata(ctx->input, frag, bsf->par_in);
128        if (err < 0) {
129            av_log(bsf, AV_LOG_ERROR, "Failed to read extradata.\n");
130            goto fail;
131        }
132
133        err = type->update_fragment(bsf, NULL, frag);
134        if (err < 0)
135            goto fail;
136
137        err = ff_cbs_write_extradata(ctx->output, bsf->par_out, frag);
138        if (err < 0) {
139            av_log(bsf, AV_LOG_ERROR, "Failed to write extradata.\n");
140            goto fail;
141        }
142    }
143
144    err = 0;
145fail:
146    ff_cbs_fragment_reset(frag);
147    return err;
148}
149
150void ff_cbs_bsf_generic_close(AVBSFContext *bsf)
151{
152    CBSBSFContext *ctx = bsf->priv_data;
153
154    ff_cbs_fragment_free(&ctx->fragment);
155    ff_cbs_close(&ctx->input);
156    ff_cbs_close(&ctx->output);
157}
158