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- /*
- * Copyright (c) 2014 Stefano Sabatini
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
- * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- */
- /**
- * @file
- * libavformat AVIOContext API example.
- *
- * Make libavformat demuxer access media content through a custom
- * AVIOContext read callback.
- * @example avio_reading.c
- */
- #include <libavcodec/avcodec.h>
- #include <libavformat/avformat.h>
- #include <libavformat/avio.h>
- #include <libavutil/file.h>
- struct buffer_data {
- uint8_t *ptr;
- size_t size; ///< size left in the buffer
- };
- static int read_packet(void *opaque, uint8_t *buf, int buf_size)
- {
- struct buffer_data *bd = (struct buffer_data *)opaque;
- buf_size = FFMIN(buf_size, bd->size);
- printf("ptr:%p size:%zu\n", bd->ptr, bd->size);
- /* copy internal buffer data to buf */
- memcpy(buf, bd->ptr, buf_size);
- bd->ptr += buf_size;
- bd->size -= buf_size;
- return buf_size;
- }
- int main(int argc, char *argv[])
- {
- AVFormatContext *fmt_ctx = NULL;
- AVIOContext *avio_ctx = NULL;
- uint8_t *buffer = NULL, *avio_ctx_buffer = NULL;
- size_t buffer_size, avio_ctx_buffer_size = 4096;
- char *input_filename = NULL;
- int ret = 0;
- struct buffer_data bd = { 0 };
- if (argc != 2) {
- fprintf(stderr, "usage: %s input_file\n"
- "API example program to show how to read from a custom buffer "
- "accessed through AVIOContext.\n", argv[0]);
- return 1;
- }
- input_filename = argv[1];
- /* register codecs and formats and other lavf/lavc components*/
- av_register_all();
- /* slurp file content into buffer */
- ret = av_file_map(input_filename, &buffer, &buffer_size, 0, NULL);
- if (ret < 0)
- goto end;
- /* fill opaque structure used by the AVIOContext read callback */
- bd.ptr = buffer;
- bd.size = buffer_size;
- if (!(fmt_ctx = avformat_alloc_context())) {
- ret = AVERROR(ENOMEM);
- goto end;
- }
- avio_ctx_buffer = av_malloc(avio_ctx_buffer_size);
- if (!avio_ctx_buffer) {
- ret = AVERROR(ENOMEM);
- goto end;
- }
- avio_ctx = avio_alloc_context(avio_ctx_buffer, avio_ctx_buffer_size,
- 0, &bd, &read_packet, NULL, NULL);
- if (!avio_ctx) {
- ret = AVERROR(ENOMEM);
- goto end;
- }
- fmt_ctx->pb = avio_ctx;
- ret = avformat_open_input(&fmt_ctx, NULL, NULL, NULL);
- if (ret < 0) {
- fprintf(stderr, "Could not open input\n");
- goto end;
- }
- ret = avformat_find_stream_info(fmt_ctx, NULL);
- if (ret < 0) {
- fprintf(stderr, "Could not find stream information\n");
- goto end;
- }
- av_dump_format(fmt_ctx, 0, input_filename, 0);
- end:
- avformat_close_input(&fmt_ctx);
- /* note: the internal buffer could have changed, and be != avio_ctx_buffer */
- if (avio_ctx) {
- av_freep(&avio_ctx->buffer);
- av_freep(&avio_ctx);
- }
- av_file_unmap(buffer, buffer_size);
- if (ret < 0) {
- fprintf(stderr, "Error occurred: %s\n", av_err2str(ret));
- return 1;
- }
- return 0;
- }
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